ABO NOCE Practice Test

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What tolerance is specified for axis power based on cylinder power of 0.75-1.50?

  1. 14°

  2. 6°

  3. 4°

  4. 3°

The correct answer is: 3°

The tolerance specified for axis power based on a cylinder power range of 0.75 to 1.50 is 3 degrees. This standard is critical in the optical industry, particularly in the fitting of lenses for patients requiring cylindrical correction for astigmatism. In this context, maintaining the appropriate axis alignment of the cylindrical power is essential to ensure optimal vision correction. When the cylinder power is in the range of 0.75 to 1.50, a tighter tolerance is required to ensure that the axis is accurate within 3 degrees. This is because even minor deviations beyond this tolerance could lead to visual discomfort or inadequate correction of the astigmatism, affecting the quality of vision provided by the lenses. This attention to detail reflects the importance of precision in optical prescriptions and the significance of adhering to established tolerances in delivering effective corrective lenses.

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